6013661 has 4 divisors (see below), whose sum is σ = 6021792. Its totient is φ = 6005532.

The previous prime is 6013627. The next prime is 6013691. The reversal of 6013661 is 1663106.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1663106 = 2 ⋅831553.

It is a cyclic number.

It is not a de Polignac number, because 6013661 - 2¹⁸ = 5751517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6013691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2831 + ... + 4476.

It is an arithmetic number, because the mean of its divisors is an integer number (1505448).

Almost surely, 2^6013661 is an apocalyptic number.

It is an amenable number.

6013661 is a deficient number, since it is larger than the sum of its proper divisors (8131).

6013661 is an equidigital number, since it uses as much as digits as its factorization.

6013661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8130.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 6013661 is about 2452.2766972754. The cubic root of 6013661 is about 181.8498641077.

Adding to 6013661 its reverse (1663106), we get a palindrome (7676767).

The spelling of 6013661 in words is "six million, thirteen thousand, six hundred sixty-one".